Chapter 783: Universe Ice Gate, Heavenly Concubine’s Real Intentions Part 1
Normally, warrior rank soul pets at most reached top tier monarch rank. Very few people would put a lot of resources into it to strengthen it to emperor rank. In fact, very few people would put together the resources to strengthen it to emperor rank. Furthermore, some picky soul pet trainers wouldn’t even raise commander rank soul pets to emperor rank. They needed monarch rank soul pets or they would directly purchase emperor rank young soul pets.
The main reason was that low species rank soul pets don’t have strong techniques or species techniques. If it learned new techniques, it wouldn't be too bad. If they didn’t learn anything new, even a warrior rank that reached emperor rank could get restricted by soul pets of the same rank that have powerful species abilities.
Of course, there were’t absolutes; it still requires a soul pet trainer...